# std::mem_fun_ref_t, std::mem_fun1_ref_t, std::const_mem_fun_ref_t, std::const_mem_fun1_ref_t

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< cpp‎ | utility‎ | functional

Defined in header `<functional>` |  |
template< class S, class T > class mem_fun_ref_t : public unary_function<T,S> { public: explicit mem_fun_ref_t(S (T::*p)()); S operator()(T& p) const; }; | (1) | (deprecated in C++11) (removed in C++17)
template< class S, class T > class const_mem_fun_ref_t : public unary_function<T,S> { public: explicit const_mem_fun_ref_t(S (T::*p)() const); S operator()(const T& p) const; }; | (2) | (deprecated in C++11) (removed in C++17)
template< class S, class T, class A > class mem_fun1_ref_t : public binary_function<T,A,S> { public: explicit mem_fun1_ref_t(S (T::*p)(A)); S operator()(T& p, A x) const; }; | (3) | (deprecated in C++11) (removed in C++17)
template< class S, class T, class A > class const_mem_fun1_ref_t : public binary_function<T,A,S> { public: explicit const_mem_fun1_ref_t(S (T::*p)(A) const); S operator()(const T& p, A x) const; }; | (4) | (deprecated in C++11) (removed in C++17)

Wrapper around a member function pointer. The class instance whose member function to call is passed as a reference to the `operator()`.

1) Wraps a non-const member function with no parameters.
2) Wraps a const member function with no parameters.
3) Wraps a non-const member function with a single parameter.
4) Wraps a const member function with a single parameter.

### See also

mem_fun_ref (deprecated in C++11)(removed in C++17) | creates a wrapper from a pointer to member function, callable with a reference to object (function template)
mem_fun_tmem_fun1_tconst_mem_fun_tconst_mem_fun1_t (deprecated in C++11)(removed in C++17) | wrapper for a pointer to nullary or unary member function, callable with a pointer to object (class template)

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